Disposable ampoule syringe



Oct 3, 1950 A. E. SMITH 2,524,362 DISPOSABLE AMPOULE SYRINGE Filed July 19, 1947 IN VENTOR.

I A770,? Y

Patented Oct. 3, 1950 OFFICE DISPOSABLE AMPOULE SYRIN GE Arthur E. Smith, Los Angeles, Calif. Application July 19, 1947, Serial No. 762,027

1 Claim.

This invention relates to disposable hypodermic syringes.

The general bject of the invention is to provide an improved, disposable, hypodermic syringe which is ready for use as soon as a needle protecting cap is removed.

A further object of the invention is to provide a hypodermic syringe of the ampule type wherein an improved piston carrying plunger moves within the ampule to cause discharge of the drug held in the ampule.

Another object of the invention is to provide a syringe including an ampule having a piston plunger therein and having a needle receiving tube in the plunger which needle serves to afford communication between the ampule and a needle on the plunger.

Other objects and advantages of my invention will be apparent from the following description taken in connection with the accompanying drawings, wherein:

Fig. l is a side elevation of an ampule embodying the features of my invention;

Fig. 2 is an extended side elevation showing the parts of my syringe before they have been assembled, and

Fig. 3 is an enlarged, central, sectional view showing the syringe ready for use.

Referring to the drawing b reference characters, I have shown my invention as embodied in a syringe indicated generally at I 0. As shown the syringe includes a cylindrical ampule or barrel l I, which may be made of plastic. A stopper l2, which may be made of rubber, is mounted in one end of the ampule. The stopper includes a projecting flange l3 and has an inwardly directed recess l4 and an outwardly directed recess l5 with a diaphragm 16 between the recesses.

The syringe includes a plunger, indicated generally at I l. The plunger, as shown, may be made of plastic or glass and is in the form of a cylindrical tube. At its rear end it has a piston stopper 18 therein. The stopper 18 includes 2. cylindrical body arranged within the plunger and having a projecting end I9 Which has piston ring forming beads 20 integral therewith. I show three of the beads 20, With the innermost bead 2| arranged at a distance from the end 22 of the stopper while the outermost bead 23 is arranged in spaced relation t the end 24 of the plunger l1.

The piston stopper l8 has a central bore 25 in which I arrange a tube 26. This tube 26 has a pointed end 21 by means of which it may be readily passed through the bore 25 of the stopper.

The inner end of the bore 25 is enlarged as: at 28.

In the forward end of the plunger I l I arrange a front member or cap 30 which is preferably made of rubber and which has an annular groove 3| in which the forward end of the tubular plunger I1 is seated as shown in Fig. 3. The front member includes a flange 32 which may be grasped by the fingers of the operator during an injection. The front member includes a recess 33 in which the forward end of the tube 26 is arranged. The front member also supports a hypodermic needle 34 which passes through a bore 34' in a tapered tip 35 on the front member. The bore 34 extends through the body of the front member and the needle 34 is resiliently engaged by the wall of the bore 34'. The forward end 36 of the hypodermic needle is sharpened and is surrounded by a cap 31 which engages the resilient tip 35.

In use the parts are constructed as described and are assembled preferabl with the plunger I 1 fully advanced into the ampule and with the tip 21 of the tube arranged in the recess M. A hypodermic needle is then inserted through the diaphragm l6 and the medicament or solution to be injected is forced into the ampule and as this occurs the piston is caused to be moved away from the stopper l2, The amount of movement of the piston indicates the amount of medicine within the ampule and when the correct amount has been passed into the ampule the hypodermic needle is withdrawn from the diaphragm IS, the hole in which seals of its own accord due to the resiliency of the stopper. The cap 37 is then placed on the tip 35 to maintain the needle 34 in sterile condition.

In use the cap 31 is removed and the needle is inserted in the patient. The cap [2 is then pushed forward a, slight distance and then Withdrawn and if blood appears in the ampule, it will show the needle is in a blood vessel, whereupon the needle may be withdrawn and correctly inserted. When the needle is correctly inserted the ampule is pushed along the plunger, thus causing an injection to be made.

From the foregoing description it will be apparent that I have invented a novel disposable hypodermic syringe which may be economically manufactured and which is highly eflicient for its intended use.

Having thus described my invention, I claim:

A syringe including a cylindrical ampule member and a plunger, a closure disposed at one end of the ampule, said plunger including a hollow, tubular body having a piston stopper at the in- '3 ner end thereof, said stopper forming a closure for the other end of the ampuie, said stopper including a portion projecting beyond the inner end of the body and having a portion slidabiy engaging the inner Wall of the ampule, said piston 5 stopper having an axial bore therethrough, the inner end of said bore being enlarged, a tube disposed in said piston bore, said plunger having a front member thereon, said front member including a portion within the plunger body and a projecting tapered tip, said front member having a finger engaging flange, said front member having an axial bore and having an enlarged recess at the inner end of the bore, said tube extending into said front member recess, and a needle in said front member bore, said needle being resiliently engaged by the front member, said needle extending into said tube.

ARTHUR E. SMITH.

4 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,712,070 Cressler Ma 7, 1929 1,817,003 Hein Aug. 4, 1931 1,848,711 Hall Mar. 8, 1932 10 2308,3223 Lockhart. Sept. 24, 1946 FOREIGN PATENTS Number Country Date 17,069 Great Britain July 22, 1909 

